- -20%
- -20%
0
Bike Sport Adventure
Cycling
Running
Outdoor
Other Sports
Tech
Automotive
Cycling
Bike
e-Bike
Cycling Clothing
Cycling Shoes
Bike Accessories
Cyclist Accessories
Components
Bike Maintenance
Nutrition & Body Care
Car Bike Racks
Bike
Cycling Clothing
Bike Accessories
Cyclist Accessories
Components
Bike Maintenance
Car Bike Racks
Running
Running Clothing
Running Footwear
Poles
Running Sunglasses
Nutrition
Backpacks - Waistepacks
Running Clothing
Backpacks - Waistepacks
Outdoor
Outdoor - Lifestyle Clothing
Outdoor Footwear
Mountain - Outdoor Equipment
Vertical Works
Urban - Travel
Luggage - Backpacks
Nutrition
Outdoor - Lifestyle Clothing
Outdoor Footwear
Mountain - Outdoor Equipment
Vertical Works
Luggage - Backpacks
Other Sports
Climbing
Home Fitness
Swim
Fishing
Ski - Snow
Tactical - Task Force
Tennis - Padel
Tech
Watches - Cycle Computers - Locators
Audio - Video - Photo - Radio
Cartography - Orienteering
Muscle Stimulators
Locators
Powermeter
Watches - Cycle Computers - Locators
Audio - Video - Photo - Radio
Cartography - Orienteering
Muscle Stimulators
Cargo Carriers - Baskets
Search here...
The Castelli Fast Feet sock has the development and testing to back up the aerodynamic claims.
Castelli Fast Feet 4 Rosso Corsa Cycling Socks, White
The Castelli Fast Feet sock has the development and testing to back up the aerodynamic claims.
4526030_001-L/XL
€40.00
€32.00
Save 20%
VAT included
You save €8.00 (20%) on the manufacturer's recommended price
Price history
- Today's price
- €32.00
- Lowest price of the last 30 days
- €32.00
- Manufacturer's recommended price
- €40.00 (20% less)
The price has not been reduced in the last 30 days. The recommended price is set by the manufacturer and is shown for reference only.
FREE SHIPPING IN ITALY FROM 129,99 EUROS*
100% SECURE CHECKOUT
N.1 in Italy in the Bike and E-Bike Shops
There are lots of so-called aero socks out there. But the Castelli Fast Feet 4 Sock has the development and testing to back up the claim. The few socks that have been tested have probably been tested with a static, nonmoving test because it's easier. But a foot is always in motion, so we created a jig that replicates the movement of the lower leg. And we tested it on actual riders to verify the results. This sock can save 2 watts at 50 km/h. The newest version has an updated cuff fit for more comfort and aerodynamic gains.
PRODUCT FEATURES
Castelli's Fast Feet project — for maximum aerodynamics
Foot portion based on Castelli Rosso Corsa Sock for in-shoe comfort
Polyurethane grip strip at top to keep sock in place
Leg portion constructed with engineered grooved Lycra® to help detach airflow
TECHNICAL FEATURES
Insulation: 1/5
Waterproofness: 1/5
Windproofness: 1/5
Breathability: 4/5
Lightness: 4/5
Weight: 287 g
Temperature: 10°C - 38°C / 50°F - 100°F
Fit: Race
Rosso Corsa
Our Rosso Corsa label is only applied to the highest-level products we make. Every thread and fiber, every curve and contour is obsessed about. Rosso Corsa represents a categorical breakthrough in cycling innovation and the meticulous craftsmanship you expect from Castelli’s performance-enhancing apparel.
PRO RIDERS
Garment supplied to the Soudal Quick-Step Team riders.
4526030_001-L/XL
Data sheet
- Gender
- Men
Women - Material
- Polyamide
- Code
- CASTS26
- Compression
- No
- Season
- All season
- Use
- Cycling
No customer reviews for the moment.
Viewed products
- -15%
- -20%
Related Products ( 16 other products in the same category )
- -20%
- -20%
- -40%
- -20%
- -30%
- -20%
- -40%
- -40%
- -30%
- -20%
- -10%
- -20%
- -20%
- -20%
- -10%
- -10%
- Out-of-Stock
Who it is for and how to use it
Ideal for
Cyclists seeking race aerodynamics
Designed for those who want a cycling sock focused on aerodynamic performance, with Race fit and a Lycra® construction.
Those wanting high breathability and low weight
Suitable for anyone looking for a 48 g lightweight model, with 4/5 breathability and engineered channels to promote air circulation.
Use across multiple seasons in road cycling
Designed for 4 seasons, with 1/5 thermal protection and 1/5 waterproofness.
Use cases
Ideal
Fast road rides
Well suited to rides where aerodynamics and sock stability around the foot and calf matter.
Race fit · Aerodynamics · Stable sock
Very suitable
Training in variable conditions
The 4-season setup and good breathability make them suitable for regular sessions throughout the year.
4 seasons · 4/5 breathability · Cycling
Very suitable
Use with a focus on comfort inside the shoe
The foot section inspired by Castelli Rosso Corsa Sock focuses on comfort inside the shoe.
Comfort · Lycra® · Foot
Suitable
Rides where positional hold matters
The anti-slip polyurethane strip helps keep the sock in position during use.
Anti-slip strip · Polyurethane · Stability
Who it is for
Performance-oriented cyclist
- Looks for
- Seeks a lightweight technical sock, with Race fit and an aerodynamic setup.
- Why
- The Lycra® construction and the Fast Feet Castelli design respond to a sport-focused use centred on riding performance.
Rides all year round
- Looks for
- Seeks a 4-season model with good airflow and low weight.
- Why
- The 4/5 breathability, 48 g weight and 1/5 thermal protection make it suitable for continuous use.
Frequently asked questions
What is the product weight?
The weight is 48 g. This places it in a very light range for a technical cycling sock.
What kind of fit does it have?
The fit is Race. It indicates a close-fitting setup, consistent with sport and aerodynamic use.
What material is it made from?
The main material is Polyamide and the fabric is Lycra®. The combination is designed for structure and foot adaptation.
Which season is it designed for?
It is indicated for 4 seasons. Thermal protection is 1/5 and waterproofness is 1/5.
How breathable is it?
Breathability is 4/5. In practice, it promotes air flow during cycling use.
Show all (6)
Does it have features to stay in place on the foot?
Yes, there is an anti-slip polyurethane strip on the upper part. It is used to keep the sock in position.
Information prepared by the BSA team with the support of AI, based on the manufacturer's specifications.